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  • C07C243/00—Compounds containing chains of nitrogen atoms singly-bound to each other, e.g. hydrazines, triazanes
  • C07C243/04—N-nitroso compounds
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  • C07C245/12—Diazo compounds, i.e. compounds having the free valencies of >N2 groups attached to the same carbon atom
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  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/46—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with hetero atoms directly attached to the ring nitrogen atom
  • C07D207/50—Nitrogen atoms
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  • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D209/56—Ring systems containing three or more rings
  • C07D209/80—[b, c]- or [b, d]-condensed
  • C07D209/82—Carbazoles; Hydrogenated carbazoles
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  • C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
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  • C07D217/08—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with only hydrogen atoms or radicals containing only carbon and hydrogen atoms, directly attached to carbon atoms of the nitrogen-containing ring; Alkylene-bis-isoquinolines with a hetero atom directly attached to the ring nitrogen atom
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  • C07D223/00—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
  • C07D223/14—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
  • C07D223/18—Dibenzazepines; Hydrogenated dibenzazepines
  • C07D223/22—Dibenz [b, f] azepines; Hydrogenated dibenz [b, f] azepines
  • C07D223/30—Dibenz [b, f] azepines; Hydrogenated dibenz [b, f] azepines with hetero atoms directly attached to the ring nitrogen atom
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  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F112/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F112/02—Monomers containing only one unsaturated aliphatic radical
  • C08F112/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F112/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
  • C08F112/22—Oxygen
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  • C08F112/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F112/02—Monomers containing only one unsaturated aliphatic radical
  • C08F112/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F112/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
  • C08F112/26—Nitrogen
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  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F112/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F112/02—Monomers containing only one unsaturated aliphatic radical
  • C08F112/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F112/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
  • C08F112/30—Sulfur
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  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F12/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F12/02—Monomers containing only one unsaturated aliphatic radical
  • C08F12/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F12/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
  • C08F12/22—Oxygen
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  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F12/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F12/02—Monomers containing only one unsaturated aliphatic radical
  • C08F12/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F12/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
  • C08F12/26—Nitrogen
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  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F12/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
  • C08F12/02—Monomers containing only one unsaturated aliphatic radical
  • C08F12/04—Monomers containing only one unsaturated aliphatic radical containing one ring
  • C08F12/14—Monomers containing only one unsaturated aliphatic radical containing one ring substituted by hetero atoms or groups containing heteroatoms
  • C08F12/30—Sulfur
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  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F8/00—Chemical modification by after-treatment
  • C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups

Definitions

• the invention relates to a polymer that can be used in standard nitrosation reactions using sodium nitrite or alkyl nitrites as reagent.
• Examples that will be given include the nitrosation of secondary amines, the diazotisation of primary amines and the acetoxylation of a-amino acids.
• the polymer according to the invention contains at least one thionitrite function (—S—N ⁇ O) grafted onto the polymer skeleton via covalent bonds. These reactive functions ensure the nitrosation reaction.
• the polymers are removed from the reaction medium, after reaction, by simple filtration, thus allowing easy isolation of the reaction products.
• the reactive polymers are readily regenerated after reaction to be reused in the same types of reaction. After regeneration, they have characteristics comparable with those of the freshly prepared polymers in terms of stability and reactivity.
• WO 99/67 296 and WO 98/05 689 also describe biodegradable polymers containing —S—NO or —NO x functions capable of releasing nitric oxide after implantation into the human body, the nitric oxide functioning as a platelet anti-aggregating agent.
• polymers of the invention bear at least one function of the formula A: in which:
• saturated aliphatic hydrocarbon-based group more particularly means a linear or branched C 1 -C 14 , preferably C 1 -C 8 , for example C 1 -C 6 and better still C 1 -C 4 alkyl group.
• alkyl groups are methyl, ethyl, propyl, isopropyl, butyl, isobutyl, t-butyl, pentyl, isopentyl, neopentyl, 2-methylbutyl, 1-ethylpropyl, hexyl, isohexyl, neohexyl, 1-methylpentyl, 3-methylpentyl, 1,1-dimethylbutyl, 1,3-dimethylbutyl, 2-ethylbutyl, 1-methyl-1-ethylpropyl, heptyl, 1-methylhexyl, 1-propylbutyl, 4,4-dimethylpentyl, octyl, 1-methylheptyl, 2-methylhexyl, 5,5-dimethylhexyl, nonyl, decyl, 1-methylnonyl, 3,7-dimethyloctyl and 7,7-dimethylocty
• the expression “optionally interrupted by one or more O or S atoms” means that in the aliphatic hydrocarbon-based chain constituting the hydrocarbon-based group, one or more carbon atoms may be replaced by one or more O or S atoms, it being understood that the resulting radical does not comprise two hetero atoms linked together.
• This expression is intended to include alkoxy and thioalkoxy groups, in which the alkyl portion is preferably as defined above.
• the carbocyclic and heterocyclic radicals include monocyclic and polycyclic radicals; these radicals preferably denote monocyclic, bicyclic or tricyclic radicals.
• polycyclic radicals it should be understood that these radicals consist of monocycles fused in pairs (for example ortho-fused or peri-fused), i.e. having at least two carbon atoms in common.
• each monocycle is 3- to 8-membered and better still 5- to 7-membered.
• the cycloalkyl groups are an example of saturated carbocyclic radicals and preferably contain from 3 to 18 and better still from 3 to 10 carbon atoms, such as cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, adamantyl or norbornyl radicals.
• the aromatic carbocyclic groups are, for example, C 6 -C 18 aryl groups and especially phenyl, naphthyl, anthryl and phenanthryl.
• heterocyclic groups comprise hetero atoms generally chosen from O, S and N, optionally in oxidised form (in the case of S and N).
• each of the monocycles constituting the heterocycle comprises from 1 to 4 hetero atoms and better still from 1 to 3 hetero atoms.
• saturated and/or aromatic cyclic (heterocyclic or carbocyclic) radical means that the said radical may comprise a saturated portion and/or an aromatic portion.
• M or P represents N
• this atom is preferably substituted by a hydrogen atom, alkyl or alkylcarbonyl.
• the aliphatic hydrocarbon-based groups, the carbocyclic groups and the heterocyclic groups, which may be aromatic or saturated, are optionally substituted.
• the substituents may be of any nature according to the invention, provided that they do not interfere with the nitrosation, diazotisation or acetoxylation reaction.
• substituents examples include a halogen atom; cyano; hydroxyl; nitro; optionally halogenated (C 1 -C 10 )alkyl; optionally halogenated (C 1 -C 10 )alkoxy; (C 6 -C 10 )alkylthio optionally substituted by (C 6 -C 10 )-arylsulphonyl, in which aryl is optionally substituted by one or more radicals G; (C 6 -C 10 )aryloxy, in which aryl is optionally substituted by one or more radicals G; (C 6 -C 10 )arylthio, in which aryl is optionally substituted by one or more radicals G; (C 1 -C 10 )alkylsulphonyl; (C 6 -C 10 )arylsulphonyl, in which aryl is optionally substituted by one or more radicals G; 5- to 7-membered heteroaryl which comprises one or more hetero
• halogen atom means a chlorine, bromine, fluorine or iodine atom.
• alkylene means a linear or branched divalent hydrocarbon-based radical containing 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms and better still 1 to 2 carbon atoms, derived from the removal of two hydrogen atoms on two different carbon atoms of a saturated hydrocarbon-based chain.
• the —CH 2 — and —CH 2 —CH 2 groups constitute alkylene radicals that are particularly preferred.
• the polymers of the invention consist of a polymer skeleton to which is covalently attached at least one function A as defined above.
• polymers examples include polymers with a skeleton of polysilicate, polyester, polyamide, polyurea, polythiourea, polyimide, polycarbonate, polyterephthalate, polysulphone, polystyrene or polyethylene glycol type, these last two polymers being preferred.
• the polymer skeleton consists of a copolymer comprising two or more polymer chains chosen from polysilicate, polyester, polyamide, polyurea, polythiourea, polyimide, polycarbonate, polyterephthalate, polysulphone, polystyrene and polyethylene glycol.
• a copolymer is a polystyrene/polyethylene glycol copolymer.
• polymer skeleton is not critical according to the invention, provided that it is in solid form.
• the polymer is in the form of particles, beads or solid spheres.
• any solid polymer skeleton preferably one that can be conditioned in the form of particles, beads or solid spheres.
• polymer skeleton in particulate form is functionalised silica.
• polystyrene copolymerised with 1-2% divinylbenzene is polystyrene copolymerised with 1-2% divinylbenzene.
• the polymer skeleton may be in the form of a functionalised film, a lantern or a crown, or any other form known to those skilled in the art.
• polymer charge denotes the number of moles of thionitrite functions per gram of polymer.
• the charge is expressed in mmol/g and is preferably between 0.4 and 6 mmol/g and better still between 0.5 and 3.5 mmol/g, for example between 1 and 3 mmol/g.
• a preferred subgroup of polymers is the group consisting of polymers for which X represents N.
• polymers that are preferred are those for which R 2 and R 3 independently represent H, (C 1 -C 8 )alkyl; (C 6 -C 10 )aryl; and R 1 represents H; (C 1 -C 8 )alkyl; (C 6 -C 10 )aryl; (C 6 -C 10 )aryloxy; heteroaryl comprising one or more hetero atoms chosen from O, S and N and consisting of one or more 5- to 8-membered monocycles; heteroaryloxy in which heteroaryl is as defined above; (C 1 -C 8 )alkylcarbonyloxy; (C 1 -C 8 )alkylcarbonylamino; (C 6 -C 10 )arylcarbonyloxy; (C 6 -C 10 )arylcarbonylamino; heteroarylcarbonyloxy; or hetero-arylcarbonyl-amino; in which heteroaryl is as defined above.
• R 2 and R 3 independently represent (C 1 -C 4 )alkyl; and R 1 represents (C 1 -C 4 )-alkylcarbonylamino.
• the function A is preferably —CH 2 —NH—CO—CH(N H—W)—C(CH 3 ) 2 —S—N ⁇ O A1; in which W represents alkanoyl (i.e. alkylcarbonyl), such as acetyl.
• the polymers of the invention are readily prepared from corresponding polymers containing —CH 2 —XH functions in which X is as defined above.
• Suitable polymers containing —CH 2 —XH functions are especially functionalised Merrifield polymers, such as those described in J. Am. Chem. Soc. 1963, 85, 2149.
• corresponding polymer means the polymer having an identical polymer skeleton and containing —CH 2 —XH functions instead of each function A.
• the process of the invention comprises the steps consisting in:
• the precursor P contains an identical number of —CH 2 —XH functions (i.e. an identical charge) to the number of functions A present in the polymer to be prepared.
• the corresponding activated derivative has the formula IB in which LG represents a leaving group and Y, R 1 , R 2 and R 3 are as defined above.
• groups LG especially include a halogen atom (and more particularly a chlorine atom); an azide group; imidazolide; p-nitrophenoxy; 1-benzotriazole; N-succinimide; acyloxy (such as pivaloyloxy); (C 1 -C 4 alkoxy)carbonyloxy; dialkyl- or dicycloalkyl-O-ureide.
• LG is the N-succinimide group of the formula:
• the reaction of the polymer with the compound of the formula I is performed at high temperature (between 40 and 200° C.) or at a lower temperature (between 10 and 150° C.) in the presence of a coupling agent, for instance a carbodiimide, optionally in the presence of an activating agent, for instance hydroxybenzotriazole or hydroxysuccinimide.
• a coupling agent for instance a carbodiimide
• an activating agent for instance hydroxybenzotriazole or hydroxysuccinimide.
• Representative coupling agents are dicycloalkyl- and dialkylcarbodiimides, carbodlimides that are soluble in an aqueous medium and especially dicyclohexylcarbodiimide, diisopropylcarbodiimide and (3-dimethylaminopropyl)-3-ethylcarbodiimide.
• the reaction is performed at a temperature that can range between 10 and 120° C., for example between 15 and 30° C.
• the reaction is preferably performed in a polar solvent, such as a halogenated aliphatic or aromatic hydrocarbon (dichloromethane, chloroform or a chlorobenzene); a ketone, such as acetone; a nitrile, such as acetonitrile; an amide, such as acetamide, formamide or dimethylformamide; or an ether, such as tetrahydrofuran, diethyl ether, diisopropyl ether, dioxane or dimethoxyethane.
• a polar solvent such as a halogenated aliphatic or aromatic hydrocarbon (dichloromethane, chloroform or a chlorobenzene); a ketone, such as acetone; a nitrile, such as acetonitrile; an amide, such as acetamide, formamide or dimethylformamide; or an ether, such as tetrahydrofuran, diethyl ether
• the solvent is preferably dimethylformamide.
• the polymer containing —CH 2 —XH functions is preferably in solid form, it is to a suspension of this polymer in an inert solvent that a solution of compound I in an inert solvent is added.
• a solution of compound I in an inert solvent is added.
• the solvent for the suspension and the solvent for the solution of compound I are identical.
• the preferred reaction conditions are those that envisage the use of equimolar amounts of substances reacting in inert solvents.
• the molar ratio of the compound of the formula I to the functions —CH 2 —XH preferably ranges between 1 and 10, for example between 1 and 6 and better still between 1 and 5.
• this agent is generally used in stoichiometric amount relative to the amount of compound of the formula I used.
• step b) the nitrosation is performed by treating the polymer resulting from step a) using any nitrosating agent.
• nitrosating agents include an alkali metal nitrite (such as sodium nitrite), an alkyl nitrite (preferably a C 1 -C 6 alkyl nitrite), such as ethyl nitrite or tert-butyl nitrite, or NO + BF 4 ⁇ .
• the process is advantageously performed in the presence of sodium nitrite.
• the process will usually be performed in a polar solvent, such as a mixture of ether, water and a carboxylic acid.
• Acetic acid is preferred as carboxylic acid.
• Cyclic ethers such as dioxane and tetrahydrofuran are preferred as ether.
• an ether such as diethyl ether, diisopropyl ether or dimethoxyethane may also be used.
• the volume ratio of the ether to water ranges between 20 and 5 and preferably between 12 and 8.
• the volume ratio of acetic acid to water ranges between 1.5 and 5 and better still between 1.5 and 3.
• step b) is preferably performed between 15 and 35° C.
• the reactive polymers of the invention can be used, for example, as reagents for the N-nitrosation of secondary amines, for the diazotisation of primary amines and for the acetoxylation of a-amino acids.
• the invention thus relates to a process for nitrosating secondary amines which consists in reacting a secondary amine with a polymer according to the invention so as to obtain the corresponding nitroso derivative.
• the nitrosation is performed in the presence of an excess of reactive functions of the formula A relative to the amount of secondary amine functions present.
• the molar ratio of the functions of the formula A of the polymer to the secondary amine functions ranges between 2 and 10 and preferably between 2 and 5.
• the nitrosation reaction is performed at a temperature of between 15 and 35° C. and better still between 20 and 25° C.
• the nitrosation reaction is preferably performed in a polar solvent, such as an aliphatic or aromatic halogenated hydrocarbon (such as dichloromethane, chloroform or chlorobenzene); an ether, such as tetrahydrofuran, dioxane, diethyl ether, diisopropyl ether or dimethoxyethane; a nitrile, such as acetonitrile; an amide, such as acetamide or dimethylformamide; or one of these solvents in deuterated form, i.e. in which one or more of the hydrogen atoms have been replaced by deuterium atoms.
• the solvent is CDCl 3 or chloroform.
• the advantage of this process is the ease of monitoring the reaction progress by thin layer chromatography or LC-MS (mass spectrography coupled to liquid chromatography).
• Another advantage is the ease with which the nitrosation reaction product is isolated, by simple filtration of the reaction medium and evaporation and/or removal of the solvents.
• the nitrosation process of the invention applies more particularly to secondary amines chosen from:
• the invention relates to a process for diazotising primary amines which consists in reacting a primary amine with a polymer according to the invention, so as to obtain the corresponding diazonium derivative.
• the process is preferably performed in the presence of an excess of reactive functions of the formula A relative to the amount of primary amine functions.
• the molar ratio of the functions of the formula A relative to the primary amine functions ranges between 2 and 10 and preferably between 2 and 5.
• reaction temperature ranges between ⁇ 10 and 35° C. and better still between 20 and 25° C.
• the solvents that are suitable for this reaction are those mentioned above for the nitrosation reaction.
• the process is preferably performed in dichloromethane or CD 2 Cl 2 .
• reaction medium a C 1 -C 4 carboxylic acid, such as acetic acid, in an at least stoichiometric amount relative to the amount of primary amine present.
• Examples of primary amines that may be mentioned include aromatic primary amines of the formula (C 6 -C 10 )aryl-NH 2 , in which (C 6 -C 10 )aryl is, for example, phenyl, naphthyl, anthryl or phenanthryl, in which the aromatic nucleus is substituted one or more times with alkyl, alkoxy, hydroxyl or cyano.
• the invention relates to a process for acetoxylating an amine of the formula III: in which R 4 represents any organic group attached to the rest of the molecule III (—CH(NH 2 )—COOH) with a carbon atom, which consists in reacting the amine of the formula III with an acid of the formula R 2 —COOH, optionally in salified form, in which R 2 represents any organic group attached to the carboxylic function via a carbon atom, this reaction being performed in the presence of a polymer as defined above, so as to obtain the corresponding compound of the formula: in which R 2 and R 4 are as defined above.
• R 2 COOH is used in the form of an alkali metal salt and corresponds, for example, to the formula R 2 COO ⁇ ,Na + .
• R 4 is, for example, optionally substituted alkyl; optionally substituted aryl; or optionally substituted cycloalkyl, the substituents being chosen, for example, from:
• R 4 is optionally substituted benzyl or phenyl;
• R 2 is as defined above for R 4 , it being understood that R 2 and R 4 are independent.
• R 2 is alkyl, such as CH 3 .
• the reaction is preferably performed at a temperature from 15 to 35° C. and better still from 20 to 25° C.
• the amounts of the reagent of the formula III and of R 2 COOH are usually stoichiometric.
• the molar ratios of the functions A and of the compound of the formula III in the reaction medium are preferably as defined above for the nitrosation and diazotisation reactions.
• the process is usually performed in the presence of a C 1 -C 4 carboxylic acid, such as acetic acid.
• the acetoxylation reaction described above is particularly suitable for acetoxylating a compound of the formula III in which R 4 represents phenyl or benzyl optionally substituted by one or more substituents chosen from alkoxy, hydroxyl, cyano and alkyl.
• the intermediate resin obtained in step a) (2.2 g, 2.57 mmol) suspended in a 10/1/0.5 dioxane/H 2 O/AcOH solvent mixture (80 ml) is treated with sodium nitrite (1 g, 14.5 mmol) and the mixture is stirred at room temperature for 24 hours.
• the resin is then filtered off and washed with an 80/20 tetrahydrofuran (THF)/H 2 O mixture (3 ⁇ 50 ml), THF (3 ⁇ 50 ml) and dichloromethane (3 ⁇ 50 ml).
• THF tetrahydrofuran
• THF THF
• dichloromethane 3 ⁇ 50 ml
• the intermediate resin containing —CH 2 —NH—CO—CH(NHAc)—C(CH 3 ) 2 —SH functions is prepared according to the protocol described in step a) of Example 1. A negative response is obtained on a sample of resin subjected to the Kaiser calorimetric test.
• the expected resin is prepared from the intermediate resin obtained in step a) according to the protocol described for the resin of Example 1.
• the expected resin is prepared from the intermediate resin obtained in step a) according to the protocol described for the resin of Example 1, step b).
• Example 1 The resin of Example 1 (50 mg, 0.048 mmol) is added to a solution of 4-[(4-methoxyphenyl)amino]benzonitrile (5 mg, 0.016 mmol) in 1.5 ml of dichloromethane (DCM). The suspension is stirred for 82 hours. The resin is then filtered off and rinsed with DCM (2 ⁇ 1.5 ml) and the filtrate is then evaporated under vacuum to give 4-[N-nitrosyl-(4-methoxyphenyl)amino]benzonitrile (4.9 mg, 86%).
• Example 1 The resin of Example 1 (350 mg, 0.31 mmol) is added to a solution of phenylalanine (21 mg, 0.131 mmol) in acetic acid (1 ml). A 1 M solution of sodium acetate in acetic acid (3 ml) is then added. The mixture is stirred at room temperature for 11 hours. The resin is then filtered off and rinsed with acetic acid (1 ml) and the filtrate is then evaporated under vacuum. The residue is taken up in ether (2 ml) and is then washed with water (2 ⁇ 2 ml). After evaporation under vacuum, 3-phenyl-2-methylcarbonyloxypropanoic acid is obtained in the form of a white powder (19.8 mg, 72%).
• Example 1 The resin of Example 1 (100 mg, 0.110 mmol) is added to a solution of ⁇ -naphthylamine (5.3 mg, 0.037 mmol) in DCM (3 ml) in the presence of acetic acid (2.16 ⁇ l, 0.037 mmol). The mixture is stirred at room temperature for one hour. The resin is then filtered off and rinsed with DCM (2 ⁇ 1 ml) and the filtrate is then evaporated under vacuum without heating to give the 2-naphthalenediazonium (4 mg, 53%).
• Example 14 and 15 were obtained from the corresponding starting amines by performing the procedure described in example 5.
• Example Starting No. Compound obtained material 1 H NMR (300 MHz) 14 CDCl 3 : 0.87 (6H, broad s), 2.02 (4H, m), 4.54 (1H, m) 15 CDCl 3 : 0.9-1 (6H, 2d), 1.65-1.88 (3H, m), 2.15 (3H, s), 5.08(1 H, m)

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• 2003
  • 2003-09-06 JP JP2004540593A patent/JP2006501335A/ja active Pending
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